server.py

#!/usr/bin/env python3
import locale
locale.setlocale(locale.LC_TIME, "de_DE.utf8")

from flask import Flask, g, current_app, request, session, flash, redirect, url_for, abort, render_template, Response, send_file as flask_send_file
from werkzeug.utils import secure_filename
from flask_script import Manager, prompt
from flask_migrate import Migrate, MigrateCommand
#from flask_socketio import SocketIO
from celery import Celery
from sqlalchemy import or_, and_
from apscheduler.schedulers.background import BackgroundScheduler
from apscheduler.triggers.cron import CronTrigger
from apscheduler.triggers.interval import IntervalTrigger
import atexit
from io import StringIO, BytesIO
import os
from datetime import datetime
import math
import mimetypes

import config
from shared import db, date_filter, datetime_filter, date_filter_long, date_filter_short, time_filter, ldap_manager, security_manager, current_user, check_login, login_required, group_required, class_filter, needs_date_test, todostate_name_filter, code_filter, indent_tab_filter
from utils import is_past, mail_manager, url_manager, get_first_unused_int, set_etherpad_text, get_etherpad_text, split_terms, optional_int_arg
from decorators import db_lookup
from models.database import ProtocolType, Protocol, DefaultTOP, TOP, Document, Todo, Decision, MeetingReminder, Error, TodoMail, DecisionDocument, TodoState, Meta, DefaultMeta
from views.forms import LoginForm, ProtocolTypeForm, DefaultTopForm, MeetingReminderForm, NewProtocolForm, DocumentUploadForm, KnownProtocolSourceUploadForm, NewProtocolSourceUploadForm, ProtocolForm, TopForm, SearchForm, NewProtocolFileUploadForm, NewTodoForm, TodoForm, TodoMailForm, DefaultMetaForm, MetaForm
from views.tables import ProtocolsTable, ProtocolTypesTable, ProtocolTypeTable, DefaultTOPsTable, MeetingRemindersTable, ErrorsTable, TodosTable, DocumentsTable, DecisionsTable, TodoTable, ErrorTable, TodoMailsTable, DefaultMetasTable
from legacy import import_old_todos, import_old_protocols, import_old_todomails

app = Flask(__name__)
app.config.from_object(config)
db.init_app(app)
migrate = Migrate(app, db)
manager = Manager(app)
manager.add_command("db", MigrateCommand)

def make_celery(app, config):
    celery = Celery(app.import_name, broker=config.CELERY_BROKER_URL)
    celery.conf.update(app.config)
    return celery
celery = make_celery(app, config)

#def make_socketio(app, config):
#    socketio = SocketIO(app)
#    return socketio
#socketio = make_socketio(app, config)

app.jinja_env.trim_blocks = True
app.jinja_env.lstrip_blocks = True
app.jinja_env.filters["datify"] = date_filter
app.jinja_env.filters["datetimify"] = datetime_filter
app.jinja_env.filters["timify"] = time_filter
app.jinja_env.filters["datify_short"] = date_filter_short
app.jinja_env.filters["datify_long"] = date_filter_long
app.jinja_env.filters["url_complete"] = url_manager.complete
app.jinja_env.filters["class"] = class_filter
app.jinja_env.filters["todo_get_name"] = todostate_name_filter
app.jinja_env.filters["code"] = code_filter
app.jinja_env.filters["indent_tab"] = indent_tab_filter
app.jinja_env.tests["auth_valid"] = security_manager.check_user
app.jinja_env.tests["needs_date"] = needs_date_test

import tasks

app.jinja_env.globals.update(check_login=check_login)
app.jinja_env.globals.update(current_user=current_user)
app.jinja_env.globals.update(zip=zip)
app.jinja_env.globals.update(min=min)
app.jinja_env.globals.update(max=max)
app.jinja_env.globals.update(dir=dir)

# blueprints here

@manager.command
def import_legacy():
    """Import the old todos and protocols from an sql dump"""
    filename = prompt("SQL-file")
    #filename = "legacy.sql"
    with open(filename, "rb") as sqlfile:
        content = sqlfile.read().decode("utf-8")
        import_old_todos(content)
        import_old_protocols(content)
        import_old_todomails(content)

# cause uwsgi currently has a bug
def send_file(file_like, cache_timeout, as_attachment, attachment_filename):
    mimetype, _ = mimetypes.guess_type(attachment_filename)
    response = Response(file_like.read(), mimetype)
    if as_attachment:
        response.headers["Content-Disposition"] = 'attachment; filename="{}"'.format(attachment_filename)
    content_type = mimetype
    if mimetype.startswith("text/"):
        content_type = "{}; charset=utf-8".format(content_type)
    response.headers["Content-Type"] = content_type
    response.headers["Cache-Control"] = "public, max-age={}".format(cache_timeout)
    response.headers["Connection"] = "close"
    return response

@app.route("/")
def index():
    user = current_user()
    protocols = [
        protocol for protocol in Protocol.query.all()
        if protocol.protocoltype.has_public_view_right(user)
    ]
    def _protocol_sort_key(protocol):
        if protocol.date is not None:
            return protocol.date
        return datetime.now().date()
    current_day = datetime.now().date()
    open_protocols = sorted(
        [
            protocol for protocol in protocols
            if not protocol.done
            and (protocol.date - current_day).days < config.MAX_INDEX_DAYS
        ],
        key=_protocol_sort_key
    )
    finished_protocols = sorted(
        [
            protocol for protocol in protocols
            if protocol.done
            and (protocol.has_public_view_right(user)
                or protocol.has_private_view_right(user))
        ],
        key=_protocol_sort_key,
        reverse=True
    )
    protocol = finished_protocols[0] if len(finished_protocols) > 0 else None
    todos = None
    if check_login():
        todos = [
            todo for todo in Todo.query.all()
            if todo.protocoltype.has_private_view_right(user)
            and not todo.is_done()
        ]
        def _todo_sort_key(todo):
            protocol = todo.get_first_protocol()
            return protocol.date if protocol.date is not None else datetime.now().date()
        todos = sorted(todos, key=_todo_sort_key, reverse=True)
    todos_table = TodosTable(todos) if todos is not None else None
    return render_template("index.html", open_protocols=open_protocols, protocol=protocol, todos=todos, todos_table=todos_table)

@app.route("/documentation")
@login_required
def documentation():
    todostates = list(TodoState)
    name_to_state = TodoState.get_name_to_state()
    return render_template("documentation.html", todostates=todostates, name_to_state=name_to_state)

@app.route("/types/list")
@login_required
def list_types():
    is_logged_in = check_login()
    user = current_user()
    types = [
        protocoltype for protocoltype in ProtocolType.query.all()
        if (protocoltype.public_group in user.groups
        or protocoltype.private_group in user.groups
        or protocoltype.is_public)]
    types = sorted(types, key=lambda t: t.short_name)
    types_table = ProtocolTypesTable(types)
    return render_template("types-list.html", types=types, types_table=types_table)

@app.route("/type/new", methods=["GET", "POST"])
@login_required
def new_type():
    form = ProtocolTypeForm()
    if form.validate_on_submit():
        user = current_user()
        if form.private_group.data not in user.groups:
            flash("Du kannst keinen internen Protokolltypen anlegen, zu dem du selbst keinen Zugang hast.", "alert-error")
        else:
            protocoltype = ProtocolType(form.name.data, form.short_name.data,
                form.organization.data, form.usual_time.data, form.is_public.data,
                form.modify_group.data, form.private_group.data, form.public_group.data,
                form.private_mail.data, form.public_mail.data,
                form.use_wiki.data, form.wiki_category.data,
                form.wiki_only_public.data, form.printer.data,
                form.calendar.data, form.restrict_networks.data,
                form.allowed_networks.data)
            db.session.add(protocoltype)
            db.session.commit()
            flash("Der Protokolltyp {} wurde angelegt.".format(protocoltype.name), "alert-success")
        return redirect(request.args.get("next") or url_for("list_types"))
    return render_template("type-new.html", form=form)

@app.route("/type/edit/<int:protocoltype_id>", methods=["GET", "POST"])
@login_required
@db_lookup(ProtocolType)
def edit_type(protocoltype):
    user = current_user()
    if not protocoltype.has_private_view_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    form = ProtocolTypeForm(obj=protocoltype)
    if form.validate_on_submit():
        if form.private_group.data not in user.groups:
            flash("Du kannst keinen internen Protokolltypen anlegen, zu dem du selbst keinen Zugang hast.", "alert-error")
        else:
            form.populate_obj(protocoltype)
            db.session.commit()
            return redirect(request.args.get("next") or url_for("show_type", protocoltype_id=protocoltype.id))
    return render_template("type-edit.html", form=form, protocoltype=protocoltype)

@app.route("/type/show/<int:protocoltype_id>")
@login_required
@db_lookup(ProtocolType)
def show_type(protocoltype):
    user = current_user()
    if not protocoltype.has_private_view_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    protocoltype_table = ProtocolTypeTable(protocoltype)
    default_tops_table = DefaultTOPsTable(protocoltype.default_tops, protocoltype)
    reminders_table = MeetingRemindersTable(protocoltype.reminders, protocoltype)
    metas_table = DefaultMetasTable(protocoltype.metas, protocoltype)
    return render_template("type-show.html", protocoltype=protocoltype, protocoltype_table=protocoltype_table, default_tops_table=default_tops_table, metas_table=metas_table, reminders_table=reminders_table, mail_active=config.MAIL_ACTIVE)

@app.route("/type/delete/<int:protocoltype_id>")
@login_required
@group_required(config.ADMIN_GROUP)
@db_lookup(ProtocolType)
def delete_type(protocoltype):
    user = current_user()
    if not protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(reqeust.args.get("next") or url_for("index"))
    name = protocoltype.name
    db.session.delete(protocoltype) 
    db.session.commit()
    flash("Der Protokolltype {} wurde gelöscht.".format(name), "alert-success")
    return redirect(request.args.get("next") or url_for("list_types"))

@app.route("/type/reminders/new/<int:protocoltype_id>", methods=["GET", "POST"])
@login_required
@db_lookup(ProtocolType)
def new_reminder(protocoltype):
    user = current_user()
    if not protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    form = MeetingReminderForm()
    if form.validate_on_submit():
        meetingreminder = MeetingReminder(protocoltype.id, form.days_before.data, form.send_public.data, form.send_private.data, form.additional_text.data)
        db.session.add(meetingreminder)
        db.session.commit()
        return redirect(request.args.get("next") or url_for("show_type", protocoltype_id=protocoltype.id))
    return render_template("reminder-new.html", form=form, protocoltype=protocoltype)

@app.route("/type/reminder/edit/<int:meetingreminder_id>", methods=["GET", "POST"])
@login_required
@db_lookup(MeetingReminder)
def edit_reminder(meetingreminder):
    user = current_user()
    if not meetingreminder.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    form = MeetingReminderForm(obj=meetingreminder)
    if form.validate_on_submit():
        form.populate_obj(meetingreminder)
        db.session.commit()
        return redirect(request.args.get("next") or url_for("show_type", protocoltype_id=protocoltype.id))
    return render_template("reminder-edit.html", form=form, protocoltype=protocoltype, meetingreminder=meetingreminder)

@app.route("/type/reminder/delete/<int:meetingreminder_id>")
@login_required
@db_lookup(MeetingReminder)
def delete_reminder(meetingreminder):
    user = current_user()
    if not meetingreminder.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    protocoltype = meetingreminder.protocoltype
    db.session.delete(meetingreminder)
    db.session.commit()
    return redirect(request.args.get("next") or url_for("show_type", protocoltype_id=protocoltype.id))

@app.route("/type/tops/new/<int:protocoltype_id>", methods=["GET", "POST"])
@login_required
@db_lookup(ProtocolType)
def new_default_top(protocoltype):
    user = current_user()
    if not protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    form = DefaultTopForm()
    if form.validate_on_submit():
        defaulttop = DefaultTOP(protocoltype.id, form.name.data, form.number.data)
        db.session.add(defaulttop)
        db.session.commit()
        flash("Der Standard-TOP {} wurde für dem Protokolltyp {} hinzugefügt.".format(defaulttop.name, protocoltype.name), "alert-success")
        return redirect(request.args.get("next") or url_for("index"))
    return render_template("default-top-new.html", form=form, protocoltype=protocoltype)

@app.route("/type/tops/edit/<int:protocoltype_id>/<int:defaulttop_id>", methods=["GET", "POST"])
@login_required
@db_lookup(ProtocolType, DefaultTOP)
def edit_default_top(protocoltype, defaulttop):
    user = current_user()
    if not protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    form = DefaultTopForm(obj=defaulttop)
    if form.validate_on_submit():
        form.populate_obj(defaulttop)
        db.session.commit()
        return redirect(request.args.get("next") or url_for("show_type", protocoltype_id=protocoltype.id))
    return render_template("default-top-edit.html", form=form, protocoltype=protocoltype, defaulttop=defaulttop)

@app.route("/type/tops/delete/<int:defaulttop_id>")
@login_required
@db_lookup(DefaultTOP)
def delete_default_top(defaulttop):
    user = current_user()
    if not defaulttop.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    db.session.delete(defaulttop)
    db.session.commit()
    return redirect(request.args.get("next") or url_for("show_type", protocoltype_id=protocoltype.id))

@app.route("/type/tops/move/<int:defaulttop_id>/<diff>/")
@login_required
@db_lookup(DefaultTOP)
def move_default_top(defaulttop, diff):
    user = current_user()
    if not defaulttop.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    try:
        defaulttop.number += int(diff)
        db.session.commit()
    except ValueError:
        flash("Die angegebene Differenz ist keine Zahl.", "alert-error")
    return redirect(request.args.get("next") or url_for("show_type", protocoltype_id=defaulttop.protocoltype.id))

@app.route("/protocols/list")
def list_protocols():
    is_logged_in = check_login()
    user = current_user()
    protocoltype = None
    protocoltype_id = None
    try:
        protocoltype_id = int(request.args.get("protocoltype"))
    except (ValueError, TypeError):
        pass
    search_term = request.args.get("search")
    protocoltypes = ProtocolType.get_public_protocoltypes(user)
    search_form = SearchForm(protocoltypes)
    if protocoltype_id is not None:
        search_form.protocoltype.data = protocoltype_id
        protocoltype = ProtocolType.query.filter_by(id=protocoltype_id).first()
    if search_term is not None:
        search_form.search.data = search_term
    protocol_query = Protocol.query
    shall_search = search_term is not None and len(search_term.strip()) > 0
    search_terms = []
    if shall_search:
        search_terms = list(map(str.lower, split_terms(search_term)))
        for term in search_terms:
            protocol_query = protocol_query.filter(or_(
                Protocol.content_public.ilike("%{}%".format(term)),
                Protocol.content_private.ilike("%{}%".format(term))
            ))
    protocols = [
        protocol for protocol in protocol_query.all()
        if (not is_logged_in and protocol.protocoltype.is_public)
        or (is_logged_in and (
            protocol.protocoltype.public_group in user.groups
            or protocol.protocoltype.private_group in user.groups))]
    def _matches_search(content):
        content = content.lower()
        for search_term in search_terms:
            if search_term.lower() not in content:
                return False
        return True
    def _matches_search_lazy(content):
        content = content.lower()
        for search_term in search_terms:
            if search_term.lower() in content:
                return True
        return False
    search_results = {} if shall_search else None
    if protocoltype_id is not None and protocoltype_id != -1:
        protocols = [
            protocol for protocol in protocols
            if protocol.protocoltype.id == protocoltype_id
        ]
    if shall_search:
        protocols = [
            protocol for protocol in protocols
            if (protocol.protocoltype.has_private_view_right(user)
                and _matches_search(protocol.content_private))
            or (protocol.has_public_view_right(user)
                and _matches_search(protocol.content_public))
        ]
        for protocol in protocols:
            content = protocol.content_private if protocol.protocoltype.has_private_view_right(user) else protocol.content_public
            lines = content.splitlines()
            matches = [line for line in lines if _matches_search_lazy(line)]
            formatted_lines = []
            for line in matches:
                parts = []
                lower_line = line.lower()
                last_index = 0
                while last_index < len(line):
                    index_candidates = list(filter(lambda t: t[0] != -1, 
                        [(lower_line.find(term, last_index), term) for term in search_terms]))
                    if len(index_candidates) == 0:
                        parts.append((line[last_index:], False))
                        break
                    else:
                        new_index, term = min(index_candidates, key=lambda t: t[0])
                        new_end_index = new_index + len(term)
                        parts.append((line[last_index:new_index], False))
                        parts.append((line[new_index:new_end_index], True))
                        last_index = new_end_index
                formatted_lines.append("".join([
                    "<b>{}</b>".format(text) if matched else text
                    for text, matched in parts
                ]))
            search_results[protocol] = "<br />\n".join(formatted_lines)
    protocols = sorted(protocols, key=lambda protocol: protocol.date, reverse=True)
    page = _get_page()
    page_count = int(math.ceil(len(protocols) / config.PAGE_LENGTH))
    if page >= page_count:
        page = 0
    begin_index = page * config.PAGE_LENGTH
    end_index = (page + 1) * config.PAGE_LENGTH
    protocols = protocols[begin_index:end_index]
    protocols_table = ProtocolsTable(protocols, search_results=search_results)
    return render_template("protocols-list.html", protocols=protocols, protocols_table=protocols_table, search_form=search_form, page=page, page_count=page_count, page_diff=config.PAGE_DIFF, protocoltype_id=protocoltype_id, search_term=search_term)

@app.route("/protocol/new", methods=["GET", "POST"])
@login_required
def new_protocol():
    user = current_user()
    protocoltypes = ProtocolType.get_modifiable_protocoltypes(user)
    form = NewProtocolForm(protocoltypes)
    upload_form = NewProtocolSourceUploadForm(protocoltypes)
    file_upload_form = NewProtocolFileUploadForm(protocoltypes)
    if form.validate_on_submit():
        protocoltype = ProtocolType.query.filter_by(id=form.protocoltype.data).first()
        if protocoltype is None or not protocoltype.has_modify_right(user):
            flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
            return redirect(request.args.get("next") or url_for("index"))
        protocol = Protocol(protocoltype.id, form.date.data)
        db.session.add(protocol)
        db.session.commit()
        tasks.push_tops_to_calendar(protocol)
        return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))
    type_id = request.args.get("type_id")
    if type_id is not None:
        form.protocoltype.data = type_id
        upload_form.protocoltype.data = type_id
    return render_template("protocol-new.html", form=form, upload_form=upload_form, file_upload_form=file_upload_form, protocoltypes=protocoltypes)

@app.route("/protocol/show/<int:protocol_id>")
@db_lookup(Protocol)
def show_protocol(protocol):
    user = current_user()
    if not protocol.protocoltype.has_public_view_right(user):
        flash("Die fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    errors_table = ErrorsTable(protocol.errors)
    visible_documents = [
        document for document in protocol.documents
        if (not document.is_private and document.protocol.has_public_view_right(user))
        or (document.is_private and document.protocol.protocoltype.has_private_view_right(user))
    ]
    documents_table = DocumentsTable(visible_documents)
    document_upload_form = DocumentUploadForm()
    source_upload_form = KnownProtocolSourceUploadForm()
    return render_template("protocol-show.html", protocol=protocol, errors_table=errors_table, documents_table=documents_table, document_upload_form=document_upload_form, source_upload_form=source_upload_form)

@app.route("/protocol/delete/<int:protocol_id>")
@login_required
@group_required(config.ADMIN_GROUP)
@db_lookup(Protocol)
def delete_protocol(protocol):
    user = current_user()
    if not protocol.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    name = protocol.get_identifier()
    protocol.delete_orphan_todos()
    db.session.delete(protocol)
    db.session.commit()
    flash("Protokoll {} ist gelöscht.".format(name), "alert-success")
    return redirect(request.args.get("next") or url_for("list_protocols"))

@app.route("/protocol/etherpull/<int:protocol_id>")
@login_required
@db_lookup(Protocol)
def etherpull_protocol(protocol):
    user = current_user()
    if not protocol.protocoltype.has_modify_right(user):
        flash("Die fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    if not config.ETHERPAD_ACTIVE:
        flash("Die Etherpadfunktion ist nicht aktiviert.", "alert-error")
        return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol_id))
    protocol.source = get_etherpad_text(protocol.get_identifier())
    db.session.commit()
    tasks.parse_protocol(protocol)
    flash("Das Protokoll wird kompiliert.", "alert-success")
    return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))

@app.route("/protocol/upload/known/<int:protocol_id>", methods=["POST"])
@login_required
@db_lookup(Protocol)
def upload_source_to_known_protocol(protocol):
    user = current_user()
    if not protocol.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    form = KnownProtocolSourceUploadForm()
    if form.validate_on_submit():
        if form.source.data is None:
            flash("Es wurde keine Datei ausgewählt.", "alert-error")
        else:
            file = form.source.data
            if file.filename == "":
                flash("Es wurde keine Datei ausgewählt.", "alert-error")
            else:
                # todo: Prüfen, ob es Text ist?
                source = file.stream.read().decode("utf-8")
                protocol.source = source
                db.session.commit()
                tasks.parse_protocol(protocol)
                flash("Das Protokoll wird kompiliert.", "alert-success")
    return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))

@app.route("/protocol/upload/new/", methods=["POST"])
@login_required
def upload_new_protocol():
    user = current_user()
    available_types = ProtocolType.get_modifiable_protocoltypes()
    form = NewProtocolSourceUploadForm(protocoltypes=available_types)
    if form.validate_on_submit():
        if form.source.data is None:
            flash("Es wurde keine Datei ausgewählt.", "alert-error")
            return redirect(request.args.get("fail") or url_for("new_protocol"))
        file = form.source.data
        if file.filename == "":
            flash("Es wurde keine Datei ausgewählt.", "alert-error")
            return redirect(request.args.get("fail") or url_for("new_protocol"))
        source = file.stream.read().decode("utf-8")
        protocoltype = ProtocolType.query.filter_by(id=form.protocoltype.data).first()
        if protocoltype is None or not protocoltype.has_modify_right(user):
            flash("Invalider Protokolltyp oder keine Rechte.", "alert-error")
            return redirect(request.args.get("fail") or url_for("new_protocol"))
        protocol = Protocol(protocoltype.id, None, source)
        db.session.add(protocol)
        db.session.commit()
        tasks.parse_protocol(protocol)
        return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))
    return redirect(request.args.get("fail") or url_for("new_protocol"))

@app.route("/protocol/upload/new/file/", methods=["POST"])
@login_required
def upload_new_protocol_by_file():
    user = current_user()
    available_types = ProtocolType.get_modifiable_protocoltypes(user)
    form = NewProtocolFileUploadForm(protocoltypes=available_types)
    if form.validate_on_submit():
        if form.file.data is None:
            flash("Es wurde keine Datei ausgewählt.", "alert-error")
            return redirect(request.args.get("fail") or url_for("new_protocol"))
        file = form.file.data
        if file.filename == "":
            flash("Es wurde keine Datei ausgewählt.", "alert-error")
            return redirect(request.args.get("fail") or url_for("new_protocol"))
        filename = secure_filename(file.filename)
        protocoltype = ProtocolType.query.filter_by(id=form.protocoltype.data).first()
        if protocoltype is None or not protocoltype.has_modify_right(user):
            flash("Invalider Protokolltyp oder keine Rechte.", "alert-error")
            return redirect(request.args.get("fail") or url_for("new_protocol"))
        protocol = Protocol(protocoltype.id, datetime.now().date(), done=True)
        db.session.add(protocol)
        db.session.commit()
        document = Document(protocol.id, filename, "", False, form.private.data)
        db.session.add(document)
        db.session.commit()
        internal_filename = "{}-{}-{}".format(protocol.id, document.id, filename)
        document.filename = internal_filename
        file.save(os.path.join(config.DOCUMENTS_PATH, internal_filename))
        db.session.commit()
        return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))
    return redirect(request.args.get("fail") or url_for("new_protocol"))

@app.route("/protocol/recompile/<int:protocol_id>")
@login_required
@group_required(config.ADMIN_GROUP)
@db_lookup(Protocol)
def recompile_protocol(protocol):
    user = current_user()
    if not protocol.protocoltype.has_modify_right(user):
        flash("Die fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    tasks.parse_protocol(protocol)
    return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))

@app.route("/protocol/source/<int:protocol_id>")
@login_required
@db_lookup(Protocol)
def get_protocol_source(protocol):
    user = current_user()
    if not protocol.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    file_like = BytesIO(protocol.source.encode("utf-8"))
    return send_file(file_like, cache_timeout=1, as_attachment=True, attachment_filename="{}.txt".format(protocol.get_identifier()))

@app.route("/protocol/template/<int:protocol_id>")
@login_required
@db_lookup(Protocol)
def get_protocol_template(protocol):
    user = current_user()
    if not protocol.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    file_like = BytesIO(protocol.get_template().encode("utf-8"))
    return send_file(file_like, cache_timeout=1, as_attachment=True, attachment_filename="{}-template.txt".format(protocol.get_identifier()))

@app.route("/protocol/etherpush/<int:protocol_id>")
@login_required
@db_lookup(Protocol)
def etherpush_protocol(protocol):
    user = current_user()
    if not protocol.protocoltype.has_modify_right(user):
        flash("Invalides Protokoll oder keine Berechtigung.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    if not config.ETHERPAD_ACTIVE:
        flash("Die Etherpadfunktion ist nicht aktiviert.", "alert-error")
        return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol_id))
    if not protocol.is_done():
        tasks.set_etherpad_content(protocol)
    return redirect(request.args.get("next") or protocol.get_etherpad_link())

@app.route("/protocol/update/<int:protocol_id>", methods=["GET", "POST"])
@login_required
@db_lookup(Protocol)
def update_protocol(protocol):
    user = current_user()
    if not protocol.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    upload_form = KnownProtocolSourceUploadForm()
    edit_form = ProtocolForm(obj=protocol)
    if edit_form.validate_on_submit():
        edit_form.populate_obj(protocol)
        db.session.commit()
        tasks.push_tops_to_calendar(protocol)
        return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))
    return render_template("protocol-update.html", upload_form=upload_form, edit_form=edit_form, protocol=protocol)

@app.route("/protocol/publish/<int:protocol_id>")
@login_required
@db_lookup(Protocol)
def publish_protocol(protocol):
    user = current_user()
    if not protocol.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    protocol.public = True
    db.session.commit()
    return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))

@app.route("/prococol/send/<int:protocol_id>")
@login_required
@db_lookup(Protocol)
def send_protocol(protocol):
    user = current_user()
    if not protocol.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    if not config.MAIL_ACTIVE:
        flash("Die Mailfunktion ist nicht aktiviert.", "alert-error")
        return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol_id))
    tasks.send_protocol(protocol)
    flash("Das Protokoll wurde versandt.", "alert-success")
    return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))

@app.route("/protocol/tops/new/<int:protocol_id>", methods=["GET", "POST"])
@login_required
@db_lookup(Protocol)
def new_top(protocol):
    user = current_user()
    if not protocol.protocoltype.has_modify_right(user):
        flash("Dir fehlen dir nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    form = TopForm()
    if form.validate_on_submit():
        top = TOP(protocol_id=protocol.id, name=form.name.data, number=form.number.data, planned=True)
        db.session.add(top)
        db.session.commit()
        tasks.push_tops_to_calendar(top.protocol)
        return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))
    else:
        current_numbers = list(map(lambda t: t.number, protocol.tops))
        suggested_number = get_first_unused_int(current_numbers)
        form.number.data = suggested_number
    return render_template("top-new.html", form=form, protocol=protocol)

@app.route("/protocol/top/edit/<int:top_id>", methods=["GET", "POST"])
@login_required
@db_lookup(TOP)
def edit_top(top):
    user = current_user()
    if not top.protocol.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    form = TopForm(obj=top)
    if form.validate_on_submit():
        form.populate_obj(top)
        db.session.commit()
        tasks.push_tops_to_calendar(top.protocol)
        return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=top.protocol.id))
    return render_template("top-edit.html", form=form, top=top)

@app.route("/protocol/top/delete/<int:top_id>")
@login_required
@db_lookup(TOP)
def delete_top(top):
    user = current_user()
    if not top.protocol.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    name = top.name
    protocol = top.protocol
    db.session.delete(top)
    db.session.commit()
    tasks.push_tops_to_calendar(protocol)
    flash("Der TOP {} wurde gelöscht.".format(name), "alert-success")
    return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))

@app.route("/protocol/top/move/<int:top_id>/<diff>")
@login_required
@db_lookup(TOP)
def move_top(top, diff):
    user = current_user()
    if not top.protocol.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    try:
        top.number += int(diff)
        db.session.commit()
        tasks.push_tops_to_calendar(top.protocol)
    except ValueError:
        flash("Die angegebene Differenz ist keine Zahl.", "alert-error")
    return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=top.protocol.id))

def _get_page():
    try:
        page = request.args.get("page")
        if page is None:
            return 0
        return int(page)
    except ValueError:
        return 0

@app.route("/todos/list")
@login_required
def list_todos():
    user = current_user()
    protocoltype = None
    protocoltype_id = None
    try:
        protocoltype_id = int(request.args.get("protocoltype"))
    except (ValueError, TypeError):
        pass
    search_term = request.args.get("search")
    protocoltypes = ProtocolType.get_public_protocoltypes(user)
    search_form = SearchForm(protocoltypes)
    if protocoltype_id is not None:
        search_form.protocoltype.data = protocoltype_id
        protocoltype = ProtocolType.query.filter_by(id=protocoltype_id).first()
    if search_term is not None:
        search_form.search.data = search_term
    todos = [
        todo for todo in Todo.query.all()
        if todo.protocoltype.has_public_view_right(user)
    ]
    if protocoltype_id is not None and protocoltype_id != -1:
        todos = [
            todo for todo in todos
            if todo.protocoltype.id == protocoltype_id
        ]
    if search_term is not None and len(search_term.strip()) > 0:
        todos = [
            todo for todo in todos
            if search_term.lower() in todo.description.lower()
        ]
    def _sort_key(todo):
        return (not todo.is_done(), todo.get_id())
    todos = sorted(todos, key=_sort_key, reverse=True)
    page = _get_page()
    page_count = int(math.ceil(len(todos) / config.PAGE_LENGTH))
    if page >= page_count:
        page = 0
    begin_index = page * config.PAGE_LENGTH
    end_index = (page + 1) * config.PAGE_LENGTH
    todos = todos[begin_index:end_index]
    todos_table = TodosTable(todos)
    return render_template("todos-list.html", todos=todos, todos_table=todos_table, search_form=search_form, page=page, page_count=page_count, page_diff=config.PAGE_DIFF, protocoltype_id=protocoltype_id, search_term=search_term)

@app.route("/todo/new", methods=["GET", "POST"])
@login_required
def new_todo():
    user = current_user()
    protocoltype_id = optional_int_arg("type_id")
    protocol_id = optional_int_arg("protocol_id")
    protocoltype = ProtocolType.query.filter_by(id=protocoltype_id).first()
    protocol = Protocol.query.filter_by(id=protocol_id).first()
    if protocoltype is not None and protocol is not None:
        if protocol.protocoltype != protocoltype:
            flash("Ungültige Protokoll-Typ-Kombination", "alert-error")
            return redirect(request.args.get("next") or url_for("index"))
    if protocoltype is None and protocol is not None:
        protocoltype = protocol.protocoltype
    protocoltypes = ProtocolType.get_modifiable_protocoltypes(user)
    form = NewTodoForm(protocoltypes)
    if form.validate_on_submit():
        added_protocoltype = ProtocolType.query.filter_by(id=form.protocoltype_id.data).first()
        if added_protocoltype is None or not added_protocoltype.has_modify_right(user):
            flash("Invalider Protokolltyp.")
            return redirect(request.args.get("next") or url_for("index"))
        todo = Todo(type_id=form.protocoltype_id.data, who=form.who.data,
            description=form.description.data, tags=form.tags.data,
            done=form.done.data)
        if protocol is not None:
            todo.protocols.append(protocol)
        db.session.add(todo)
        db.session.commit()
        todo.number = todo.id
        db.session.commit()
        flash("Todo wurde angelegt.", "alert-success")
        if protocol is not None:
            return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))
        else:
            return redirect(request.args.get("next") or url_for("list_todos", protocoltype_id=protocoltype_id))
    else:
        if protocoltype is not None:
            form.protocoltype_id.data = protocoltype.id
    return render_template("todo-new.html", form=form, protocol=protocol, protocoltype=protocoltype)

@app.route("/todo/edit/<int:todo_id>", methods=["GET", "POST"])
@login_required
@db_lookup(Todo)
def edit_todo(todo):
    user = current_user()
    if not todo.protocoltype.has_modify_right(user):
        flash("Invalides Todo oder unzureichende Berechtigung.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    form = TodoForm(obj=todo)
    if form.validate_on_submit():
        form.populate_obj(todo)
        db.session.commit()
        return redirect(request.args.get("next") or url_for("list_todos", protocoltype=todo.protocoltype.id))
    return render_template("todo-edit.html", form=form, todo=todo)

@app.route("/todo/show/<int:todo_id>")
@login_required
@db_lookup(Todo)
def show_todo(todo):
    user = current_user()
    if not todo.protocoltype.has_private_view_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    todo_table = TodoTable(todo)
    return render_template("todo-show.html", todo=todo, todo_table=todo_table)

@app.route("/todo/delete/<int:todo_id>")
@login_required
@db_lookup(Todo)
def delete_todo(todo):
    user = current_user()
    if not todo.protocoltype.has_private_view_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    type_id = todo.protocoltype.id
    db.session.delete(todo)
    db.session.commit()
    flash("Todo gelöscht.", "alert-success")
    return redirect(request.args.get("next") or url_for("list_todos", protocoltype=type_id))

@app.route("/decisions/list")
def list_decisions():
    is_logged_In = check_login()
    user = current_user()
    protocoltype = None
    protocoltype_id = None
    try:
        protocoltype_id = int(request.args.get("protocoltype"))
    except (ValueError, TypeError):
        pass
    search_term = request.args.get("search")
    protocoltypes = ProtocolType.get_public_protocoltypes(user)
    search_form = SearchForm(protocoltypes)
    if protocoltype_id is not None:
        search_form.protocoltype.data = protocoltype_id
        protocoltype = ProtocolType.query.filter_by(id=protocoltype_id).first()
    if search_term is not None:
        search_form.search.data = search_term
    decisions = [
        decision for decision in Decision.query.all()
        if decision.protocol.has_public_view_right(user)
    ]
    if protocoltype_id is not None and protocoltype_id != -1:
        decisions = [
            decision for decision in decisions 
            if decision.protocol.protocoltype.id == protocoltype_id
        ]
    if search_term is not None and len(search_term.strip()) > 0:
        decisions = [
            decision for decision in decisions
            if search_term.lower() in decision.content.lower()
        ]
    decisions = sorted(decisions, key=lambda d: d.protocol.date, reverse=True)
        
    page = _get_page()
    page_count = int(math.ceil(len(decisions) / config.PAGE_LENGTH))
    if page >= page_count:
        page = 0
    begin_index = page * config.PAGE_LENGTH
    end_index = (page + 1) * config.PAGE_LENGTH
    decisions = decisions[begin_index:end_index]
    decisions_table = DecisionsTable(decisions)
    return render_template("decisions-list.html", decisions=decisions, decisions_table=decisions_table, search_form=search_form, page=page, page_count=page_count, page_diff=config.PAGE_DIFF, protocoltype_id=protocoltype_id, search_term=search_term)

@app.route("/document/download/<int:document_id>")
@db_lookup(Document)
def download_document(document):
    user = current_user()
    if ((document.is_private
            and not document.protocol.protocoltype.has_private_view_right(user))
        or (not document.is_private
            and not document.protocol.has_public_view_right(user))):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    return send_file(document.as_file_like(), cache_timeout=1, as_attachment=True, attachment_filename=document.name)

@app.route("/document/upload/<int:protocol_id>", methods=["POST"])
@login_required
@db_lookup(Protocol)
def upload_document(protocol):
    user = current_user()
    if not protocol.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    form = DocumentUploadForm()
    if form.document.data is None:
        flash("Es wurde keine Datei ausgewählt.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    file = form.document.data
    if file.filename == "":
        flash("Es wurde keine Datei ausgewählt.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    # todo: Dateitypen einschränken?
    if file:
        filename = secure_filename(file.filename)
        document = Document(protocol.id, filename, "", False, form.private.data)
        db.session.add(document)
        db.session.commit()
        internal_filename = "{}-{}-{}".format(protocol.id, document.id, filename)
        document.filename = internal_filename
        file.save(os.path.join(config.DOCUMENTS_PATH, internal_filename))
        if datetime.now().date() >= protocol.date:
            protocol.done = True
        db.session.commit()
    return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))

@app.route("/document/delete/<int:document_id>")
@login_required
@group_required(config.ADMIN_GROUP)
@db_lookup(Document)
def delete_document(document):
    user = current_user()
    if not document.protocol.protocoltype.has_modify_right(user):
        flash("Dir fehlen die nötigen Zugriffsrechte.", "alert-error")
        return redirect(request.args.get("next") or url_for("index"))
    name = document.name
    protocol = document.protocol
    db.session.delete(document)
    db.session.commit()
    flash("Das Dokument {} wurde gelöscht.".format(name), "alert-success")
    return redirect(request.args.get("next") or url_for("show_protocol", protocol_id=protocol.id))